Optimization of the building envelope as well as heating and ventilation system in a one family house with respect to energy consumption, indoor climate and economy
The main aim of the project has been to reduce the energy consumption for new buildings by documenting the possibilities for lowering the present energy frame when building regulations are altered in 2005.
The starting point is a wish to reduce the consumption of energy in new building, for instance by laying down a lower energy limit. For that reason there is a need to illustrate where the economically optimal energy limit is under different scenarios of the price trend in the energy field. Thus, the object of the project is, in co-operation with a standard-house firm, to carry out overall economic analyses of different known and new proposals for energy-conserving provisions in the shape of better insulation of the building envelope and utilization of heat recovery etc. Further, the object is, in the form of measurements on a model house, to prove that it is possible to build good houses with regard to evonomy, indoor climate and architecture even though they are insulated etc. so that the need for heating is decreased by 50 per cent compared with BR-95. A model house will be constructed and measured with optimized solutions in order to document the conditions with regard to consumption of energy, indoor climate and economy as well as architecture
The purpose has been to cooperate with a building contractor (Bulow and Nielsen) in developing a new 1-family house based on existing principles, by performing economic analysis based on total cost for different kinds of existing and new measures, e.g. higher degree of insulation, reducing thermal bridge effects and utilising heat recovery for the ventilation system, and hereby reducing the overall energy consumption. The purpose was to develop a 1-family house to 2 different levels of the energy consumption, i.e. 33% and 50% reduction compared to the present energy frame. The 50% reduction was only to be studied in theory, and only the 33% reduction was tested in practice. After performing the technical analysis, the building contractors have built the house, and then detailed measurements of energy consumption and indoor climate were carried out, so that the results of the theoretical studies could be verified. The project is a part of the frame programme concerning the upcoming Building regulations in 2005, and will be part of the foundation in deciding the future demands for the energy consumption of new buildings. The main results of the project are, that by increasing insulation thicknesses in the building constructions, reducing the thermal bridge effects at building joints, using an effective heat recovery for the ventilation air and carefully designing the house to be very airtight one can reduce the energy consumption of a 1-family house by 33% or 50% without changing the general appearance of the building as such. The 1-family house corresponding to the 33% reduction has been built in Brøndby Strand, and measurements have shown that the theoretical studies are quite accurate in simulating the building. However, the measurements have also shown that the heat recovery unit did not have the expected efficiency as stated by the producer, and this means that the house does not live up to the initial expectations. Comparing the measured heat consumption to the calculated heat consumption shows a fine coherence, and therefore it is concluded that the purpose of the project has been fulfilled. The project has achieved a very positive result by showing that it is possible to reduce heat consumption by 33% or more for a 1family house without changing the general appearance or the total cost of the building significantly
Key figures
Category
Participants
| Partner | Subsidy | Auto financing |
|---|---|---|
| Bülow og Nielsen Enfamiliehuse A/S |
Contact
Bygning 118
DK-2800 Lyngby, Denmark
Svensen, Svend (professor), 45251854, ss@ibe.dtu.dk
Øvr. Partnere: Bülow og Nielsen Enfamiliehuse A/S
